batgrbproduct Analysis for Trigger=344308
Analysis Summary
Notes:
- 1) No attempt has been made to eliminate the non-significant decimal places.
- 2) This batgrbproduct analysis is done of the amount of data for this trigger downloaded to date.
- 3) This page will be updated for up to 8 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.42
Process Start Time (local time): Thu Feb 26 20:59:11 EST 2009
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger344308/GCN5_download_cron
======================================================================
Trigger: 00344308 Segment: 000
BAT Trigger Time: 257375778.368 [s; MET]
Trigger Stop: 257375779.392 [s; MET]
UTC: 2009-02-26T21:16:13.836460 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 37.3297731396354 Dec: -53.3181311226447 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 5.92
Image Trigger?: NO
Rate S/N Ratio: 38.4837628097877 [ if not an image trigger ]
Image S/N Ratio: 5.92
Flight Position: [ source = BAT ]
RA: 37.3297731396354 Dec: -53.3181311226447 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 37.2173735911599 Dec: -53.30782467579 [deg; J2000]
{ 02h 28m 52.2s , -53d 18' 28.2" }
+/- 4.90616580580133 [arcmin] (estimated 90% radius based on SNR)
+/- 3.62026120885607 [arcmin] (formal 1-sigma fit error)
SNR: 3.13576694781475
Angular difference between Flight and Ground position is 4.076321 arcmin
Partial Coding Fraction: 0.9921875 [ including projection effects ]
Duration
T90: 1.02399998903275 +/-
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
T50: 1.02399998903275 +/-
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 1.02399998903275 second)
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.002896 0.011116 0.015604 0.030984
0.006604 0.007508 0.007701 0.009332 [error]
Peak 0.002896 0.011116 0.015604 0.030984
0.006604 0.007508 0.007701 0.009332 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
=== Fluence/Peak Flux Summary ===
Model Band1 Band2 Band3 Band4 Band5 Total
15-25 25-50 50-100 100-350 15-150 15-350 keV
Fluence Power-law 3.85e-10 2.54e-09 1.46e-08 4.03e-07 4.92e-08 2.76e-07 erg/cm2
Error 8.97e-10 3.14e-09 1.10e-08 5.11e-07 2.12e-08 0.00e+00 erg/cm2
Peak flux Power-law 1.16e-02 4.04e-02 1.17e-01 1.03e+00 3.22e-01 1.20e+00 ph/cm2/s
Error 2.77e-02 5.16e-02 8.94e-02 1.41e+00 2.30e-01 1.21e+00 ph/cm2/s
Fluence Cutoff-PL 3.85e-10 2.54e-09 1.47e-08 4.01e-07 4.93e-08 2.71e-07 erg/cm2
Error 8.96e-10 3.14e-09 1.11e-08 6.05e-07 2.12e-08 0.00e+00 erg/cm2
Peak flux Cutoff-PL 1.16e-02 4.04e-02 1.17e-01 1.03e+00 3.22e-01 1.20e+00 ph/cm2/s
Error 2.76e-02 4.84e-02 8.94e-02 1.55e+00 2.23e-01 1.35e+00 ph/cm2/s
Fluence Band 2.94e-10 2.30e-09 1.46e-08 3.93e-07 4.93e-08 1.43e-07 erg/cm2
Error 8.90e-10 3.13e-09 1.21e-08 7.56e-07 1.64e-08 0.00e+00 erg/cm2
Peak flux Band 1.15e-02 4.03e-02 1.17e-01 1.03e+00 3.22e-01 1.15e+00 ph/cm2/s
Error 2.75e-02 5.18e-02 9.66e-02 1.55e+00 2.36e-01 2.95e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL -0.529 1.654 - - 1.89e-03 1.86e-03 40.850 57
CPL -0.550 1.786 9992.2 5000.0 1.92e-03 1.88e-03 40.851 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL -0.529 1.654 - - 1.89e-03 1.86e-03 40.850 57
CPL -0.550 1.786 9992.2 5000.0 1.92e-03 1.88e-03 40.851 56
Model : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index : photon index: E^-{Ph_index} (minus sign is not included in the index)
Ph_90err : 90% error of the photon index
Epeak : Epeak in keV
Epeak_90err: 90% error of Epeak
Norm : normalization at 50 keV in PL model and at 1 keV in CPL model
Nomr_90err : 90% error of the normalization
chi2 : Chi-Squared
dof : degree of freedom
=== T90/T50 calculation in the 50-300 keV band (BATSE band) using 64 ms lc ===
T90 in the 50-300 keV band: 0.064000 sec.
T50 in the 50-300 keV band: 0.064000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 1.024 0.000 1.024
T90 1.024 0.000 1.024
T50 1.024 0.000 1.024
Peak 1.024 0.000 1.024
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
37.2174 -53.3078 0.0610 16.9 -35.8 0.0523 3.1 TRIG_00344308
------------------------------------------
Foreground time interval of the image:
0.000 1.024 (delta_t = 1.024 [sec])
Background time interval of the image:
-60.368 -50.292 (delta_t = 10.076 [sec])
-49.368 -10.368 (delta_t = 39.000 [sec])
Lightcurves
Notes:
- 1) All plots contain as much data as has been downloaded to date.
- 2) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 3) For all the mask-weighted lightcurves, the y-axis units are counts/sec/det where a det is 0.4 x 0.4 = 0.16 sq cm.
- 4) The verticle lines correspond to following: green dotted lines are T50 interval, black dotted lines are T90 interval, blue solid line(s) is a spacecraft slew start time, and orange solid line(s) is a spacecraft slew end time.
- 5) Time of each bin is in the middle of the bin.
1 s binning
From T0-310 s to T0+310 s
From T100_start - 20 s to T100_end + 30 s
Full time interval
64 ms binning
Full time interval
From T100_start to T100_end
From T0-5 sec to T0+5 sec
16 ms binning
From T100_start-5 s to T100_start+5 s
8 ms binning
From T100_start-3 s to T100_start+3 s
2 ms binning
From T100_start-1 s to T100_start+1 s
SN=5 or 10 sec. binning (whichever binning is satisfied first)
SN=5 or 10 sec. binning (T < 200 sec)
Spectra
Notes:
- 1) The fitting includes the systematic errors.
- 2) For long bursts, a spectral fit of the pre-slew DRM will introduce some errors in both a spectral shape and a normalization if the PHA file contains a lot of the slew/post-slew time interval.
- 3) For fits to more complicated models (e.g. a power-law over a cutoff power-law), the BAT team has decided to require a chi-square improvement of more than 6 for each extra dof.
- 4) For short bursts (T90<1sec), the specrtum is also fit with Blackbody, OTTB, and Double Blackbody.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.529238 ( -2.19889 1.10990 )
Norm@50keV : 1.890949E-03 ( -1.890949E-03 1.837465E-03) )
------------------------------------------------------------
Chi-Squared = 40.85044 using 59 PHA bins.
Reduced chi-squared = 0.7166744 for 57 degrees of freedom
Null hypothesis probability = 0.947
Photon flux (15-150 keV) in 1.024 sec: 0.321940 ( -0.30087 0.159893 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.92133e-08 ( -2.1167e-08 2.11472e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.550300 ( -2.44970 1.12139 )
Epeak [keV] : 9992.22 ( -9992.21 7.77832 )
Norm@50keV : 1.918653E-03 ( -1.918653E-03 1.845582E-03) )
------------------------------------------------------------
Chi-Squared = 40.85115 using 59 PHA bins.
Reduced chi-squared = 0.7294847 for 56 degrees of freedom
Null hypothesis probability = 0.936
Photon flux (15-150 keV) in 1.024 sec: 0.322287 ( -0.287276 0.159491 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.9305e-08 ( -2.12389e-08 2.11956e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.361984E-02 ( -9.98638 5.01362 )
beta : 0.529133 ( -1.10983 2.19801 )
Epeak [keV] : 22.5556 ( -22.4556 9977.44 )
Norm@50keV : 2.914604E-03 ( -2.914604E-03 2498.72 )
------------------------------------------------------------
Chi-Squared = 40.85044 using 59 PHA bins.
Reduced chi-squared = 0.7427353 for 55 degrees of freedom
Null hypothesis probability = 0.922
Photon flux (15-150 keV) in 1.024 sec: 0.322289 ( -0.312045 0.159489 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.9256e-08 ( -2.12041e-08 1.1528e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.529238 ( -2.19889 1.10990 )
Norm@50keV : 1.890949E-03 ( -1.890949E-03 1.837465E-03) )
------------------------------------------------------------
Chi-Squared = 40.85044 using 59 PHA bins.
Reduced chi-squared = 0.7166744 for 57 degrees of freedom
Null hypothesis probability = 0.947
Photon flux (15-150 keV) in 1.024 sec: 0.321940 ( -0.30087 0.159893 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.92133e-08 ( -2.1167e-08 2.11472e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.550300 ( -2.44970 1.12139 )
Epeak [keV] : 9992.22 ( -9992.21 7.77832 )
Norm@50keV : 1.918653E-03 ( -1.918653E-03 1.845582E-03) )
------------------------------------------------------------
Chi-Squared = 40.85115 using 59 PHA bins.
Reduced chi-squared = 0.7294847 for 56 degrees of freedom
Null hypothesis probability = 0.936
Photon flux (15-150 keV) in 1.024 sec: 0.322287 ( -0.287276 0.159491 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.9305e-08 ( -2.12389e-08 2.11956e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.361984E-02 ( -9.98638 5.01362 )
beta : 0.529133 ( -1.10983 2.19801 )
Epeak [keV] : 22.5556 ( -22.4556 9977.44 )
Norm@50keV : 2.914604E-03 ( -2.914604E-03 2498.72 )
------------------------------------------------------------
Chi-Squared = 40.85044 using 59 PHA bins.
Reduced chi-squared = 0.7427353 for 55 degrees of freedom
Null hypothesis probability = 0.922
Photon flux (15-150 keV) in 1.024 sec: 0.322289 ( -0.312045 0.159489 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.9256e-08 ( -2.12041e-08 1.1528e-08 ) ergs/cm2
Plot creation:
Thu Feb 26 21:09:19 EST 2009